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參數(shù)資料
| 型號： | CXD2548R |
| 廠商： | Sony Corporation |
| 元件分類： | 數(shù)字信號處理 |
| 英文描述： | CD Digital Signal Processor with Built-in Digital Servo and DAC |
| 中文描述： | CD數(shù)字信號處理器，具有內置數(shù)字伺服和DAC |
| 文件頁數(shù)： | 57/113頁 |
| 文件大?。?/td> | 1286K |
| 代理商： | CXD2548R |
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CXD2548R
3-2. Frame Sync Protection
In normal-speed playback, a frame sync is recorded approximately every 136μs (7.35kHz). This signal is
used as a reference to recognize the data within a frame. Conversely, if the frame sync cannot be
recognized, the data is processed as error data because the data cannot be recognized. As a result,
recognizing the frame sync properly is extremely important for improving playability.
In the CXD2548R, window protection and forward protection/backward protection have been adopted for
frame sync protection. These functions achieve very powerful frame sync protection. There are two window
widths: one for cases where a rotational disturbance affects the player and the other for cases where there is
no rotational disturbance (WSEL = 0/1). In addition, the forward protection counter is fixed to 13, and the
backward protection counter to 3. Concretely, when the frame sync is being played back normally and then
cannot be detected due to scratches, a maximum of 13 frames are inserted. If frame sync cannot be detected
for 13 frames or more, the window opens to resynchronize the frame sync.
In addition, immediately after the window opens and the resynchronization is executed, if a proper frame
sync cannot be detected within 3 frames, the window opens immediately.
3-3. Error Correction
In the CD format, one 8-bit data contains two error correction codes, C1 and C2. For C1 correction, the code
is creased with 28-byte information and 4-byte C1 parity.
For C2 correction, the code is created with 24-byte information and 4-byte C2 parity.
Both C1 and C2 are Reed Solomon codes with a minimum distance of 5.
The CXD2548R's SEC strategy uses powerful frame sync protection and C1 and C2 error correction to
achieve high playability.
The correction status can be monitored externally.
See Table 3-1.
When the C2 pointer is high, the data in question was uncorrectable. Either the pre-value was held or an
average value interpolation was made for the data.
MNT3
0
0
0
1
1
1
MNT1
0
0
1
0
0
1
MNT0
0
1
1
0
1
1
Description
No C1 errors
One C1 error corrected
C1 correction impossible
No C2 errors
One C2 error corrected
C2 correction impossible
Table 3-1.
相關PDF資料 |
PDF描述 |
|---|---|
| CXD2552 | 1 BIT D/A CONVERTER |
| CXD2552Q | 1 BIT D/A CONVERTER |
| CXD2597Q | CD Digital Signal Processor with Built-in Digital Servo and DAC |
| CXD2720Q-2 | CAP 10UF 50V 20% TANT SMD-7343-43 TR-13 GOLD |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| CXD2550P | 制造商:SONY 制造商全稱:Sony Corporation 功能描述:Digital Filter for CD |
| CXD2551M | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Digital Filter |
| CXD2551M/P | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Digital Filter |
| CXD2551P | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Digital Filter |
| CXD2552 | 制造商:SONY 制造商全稱:Sony Corporation 功能描述:1 BIT D/A CONVERTER |
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